.\" Author:	Juli Mallett <jmallett@FreeBSD.org>
.\" Date:	June 04, 2003
.\" Description:
.\" 	Manual page for libufs functions:
.\"		ufs_disk_close(3)
.\"		ufs_disk_fillout(3)
.\"		ufs_disk_fillout_blank(3)
.\"		ufs_disk_write(3)
.\"
.\" This file is in the public domain.
.\"
.Dd November 17, 2023
.Dt UFS_DISK_CLOSE 3
.Os
.Sh NAME
.Nm ufs_disk_close ,
.Nm ufs_disk_fillout ,
.Nm ufs_disk_fillout_blank ,
.Nm ufs_disk_write
.Nd open and close userland UFS disks
.Sh LIBRARY
.Lb libufs
.Sh SYNOPSIS
.In sys/param.h
.In sys/mount.h
.In ufs/ufs/ufsmount.h
.In ufs/ufs/dinode.h
.In ufs/ffs/fs.h
.In libufs.h
.Ft int
.Fn ufs_disk_close "struct uufsd *disk"
.Ft int
.Fn ufs_disk_fillout "struct uufsd *disk" "const char *name"
.Ft int
.Fn ufs_disk_fillout_blank "struct uufsd *disk" "const char *name"
.Ft int
.Fn ufs_disk_write "struct uufsd *disk"
.Sh DESCRIPTION
The
.Fn ufs_disk_close
function closes a disk and frees internal memory related to it.
It does not free the
.Fa disk
structure.
.Pp
The
.Fn ufs_disk_fillout
and
.Fn ufs_disk_fillout_blank
functions open a disk specified by
.Fa name
and populate the structure pointed to by
.Fa disk .
The structure referenced by the
.Fa disk
pointer must be aligned to at least the alignment specified by
.Dv LIBUFS_ALIGN
that is defined in the
.Lb libufs.h
header file.
The disk is opened read-only.
The specified
.Fa name
may be either a mountpoint, a device name or a filesystem image.
The
.Fn ufs_disk_fillout
function assumes there is a valid superblock and will fail if not,
whereas the
.Fn ufs_disk_fillout_blank
function makes no assumptions of that sort.
.Pp
The
.Fn ufs_disk_write
function attempts to re-open a disk as writable if it is not currently.
.Sh ERRORS
The function
.Fn ufs_disk_close
has no failure points.
.Pp
The function
.Fn ufs_disk_fillout
may fail for any of the reasons
.Fn ufs_disk_fillout_blank
might, as well as for any reason
.Xr sbread 3
might.
.Pp
The
.Fn ufs_disk_fillout_blank
may fail and set
.Va errno
for any of the errors specified for the library functions
.Xr open 2 ,
.Xr strdup 3 .
Additionally, it may follow the
.Xr libufs 3
error methodologies in situations where no device could be found to
open.
.Pp
The function
.Fn ufs_disk_write
may fail and set
.Va errno
for any of the errors specified for the library functions
.Xr open 2
and
.Xr stat 2 .
Namely, it will fail if the disk in question may not be written to.
.Sh SEE ALSO
.Xr open 2 ,
.Xr getfsfile 3 ,
.Xr libufs 3 ,
.Xr sbread 3
.Sh HISTORY
These functions first appeared as part of
.Xr libufs 3
in
.Fx 5.0 .
.Sh AUTHORS
.An Juli Mallett Aq Mt jmallett@FreeBSD.org
